How many couples has this happen to? I am sure it is quite a few. Even in just a group of friends there is always two or more that just do not get along. But then; all of the sudden the comradery switches up. Same group different comradery among them. I believe this to be common especially among couples because the group is smaller. It is hard to find mutual friends between couples. The priority should always be the couple.
I suggest that just getting out is a positive if anything.
I found this episode to be at the top of the list funny!